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STOCK BASED AND DEFERRED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Compensation Expense and Stock Award Activity | Below is a summary of compensation expense and stock award activity (dollars in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Stock-based compensation expense | $ | 5,845 |  |  | $ | 6,130 |  |  | $ | 14,435 |  |  | $ | 15,724 |
Non-vested shares granted | 4,114 |  |  | 2,112 |  |  | 225,666 |  |  | 225,593 |
Performance-based non-vested shares granted | — |  |  | — |  |  | 46,593 |  |  | 56,139 |
Performance-based shares issued in excess of target shares granted (1) | — |  |  | — |  |  | 37,425 |  |  | 24,054 |
Restricted stock awards vested (includes performance-based awards) | 3,615 |  |  | 8,610 |  |  | 438,344 |  |  | 413,016 |
(1)Performance-based shares that vested and were issued as a result of performance achievement exceeding the originally established targeted number of shares related to respective performance metrics.
Summary of Additional Information Regarding Stock Plan | The following table includes additional information regarding our stock compensation plan (dollars in thousands):
|  | As of
|  | September 30, 2021 |  | December 31, 2020
Unrecognized stock-based compensation cost |  | $ | 29,890 |  |  | $ | 22,687 |
Weighted average years expense recognition period |  | 2.02 |  | 2.01
Total equity awards outstanding (1) |  | 910,557 |  |  | 1,098,545 |
(1)Includes unvested restricted stock, performance-based awards (assuming 100% payout) and restricted stock units.

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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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